It's designed to show off just how well Wine works to bring Windows-based code to other platforms, and wake Google up to the fact that if they wanted to port Chrome over, they could. CrossOver says they did this to prove a point (and the point seems proven), but it's likely not only that Google wants to run the code natively, but that they wanted to focus on their largest audience first, which anyone can tell you is likely still the Windows crowd.

Even CrossOver says their version isn't ready for prime-time yet, they just wanted to show how fast it could be done. Let this be a lesson, Google: don't tell virtual software developers what they can't do.